The Ulam spiral displaying 2025 numbers [La spirale d'Ulam montrant 2025 nombres entiers].




Starting from the center of the picture, the 2025 little squares are numbered (N=1, 2, 3,..., 2025) when following a square spiral. The number 1 is the green square when the prime numbers are the white ones.


It is interesting to compare this Ulam spiral to a random pictures containing the same percentage of white squares (15%) .


See the generalized Ulam spiral:




[Plus d'informations à propos de la spirale d'Ulam et de ses généralisations -en français/in french-]
[More information about the Ulam spiral and ist generalizations -in english/en anglais-]


(CMAP28 WWW site: this page was created on 04/25/2012 and last updated on 08/22/2020 11:13:44 -CEST-)



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[The Y2K bug [Le bug de l'an 2000]]

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